diff --git a/tests/unit/dynports.cc b/tests/unit/dynports.cc
index 953c3b7..38ca0da 100644
--- a/tests/unit/dynports.cc
+++ b/tests/unit/dynports.cc
@@ -1,3 +1,4 @@
+#include <string>
 #include <stdexcept>
 
 #include "dynports.hh"